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What is our online precision CNC machining parts service?

VMT has 300 machine tools, the online precision cnc machining service provided has greatly shortened the production cycle and reduced the cost of parts, and quickly produced a large number of high-precision cnc turning and milling parts. We have a large number of customized processing partners, and have passed SGS on-site inspection, ISO9001: 2015 certification, IATF16949.VMT can use more than 40 metal materials to process parts, and detect the surface finish of the product and perform different surface treatments. Come and contact us for free samples and design analysis solutions and quotations.





How do we start precision CNC machining  parts service?

Our concept is to make the best custom CNC machining parts from the beginning!

  • Free evaluation of precision CNC machining

    Propose your idea or 3D or CAD files, and we will start your project for free evaluation immediately. Our goal is to complete the quality and cost-effective plan for your parts within 30 minutes.

  • DFM analysis
    Before custom machined components parts starting production, we will execute DFM analysis and develop a process control plan for all quality risk points. Our engineers will program based on DFM risk points, and then arrange tools and cutter to ensure the consistency of part quality.

  • Quality control

    During the precision machined parts production process, our QC engineers will conduct patrol inspections based on the engineering drawings, and follow certain test methods and frequencies to ensure that the quality meets the requirements of the drawings (appearance, dimensions, tolerances).







The working principle of VMT CNC machining





Quotation - 2 hours quotation, 4 hours manufacturing feasibility program service and advice.


Engineering and Design - If your project is at an early stage, free assistance to customers to optimize 
product structure and design 2D drawings.

Custom Designs-Production of any complex precision CNC machined parts according to customer 

drawings and sample designs.

Efficiency - 1. All equipment is fully equipped in the factory, and the delivery can basically be completed quickly.
2. The dismantling process is adopted in all, and the combination of various numerical control processing 
methods improves the processing efficiency.
Sample Delivery—Delivery samples in one week, record sample problem points, make mass production 
smooth, and provide temporary countermeasures within 2 hours for customer parts abnormality.

Quality Assurance - Every job goes through a rigorous quality testing process. Inspections include 3D CMM 

measuring instrument, height gauge, salt spray tester, etc. VMT offers special packaging customization to 

ensure your parts arrive safely.


    Quality Service——Every production run is well documented and transparently shared with the clients.






The classification and advantages-disadvantages of CNC machines, not all precision CNC machining parts are suitable for one type of CNC machine.



Machine type  Advantages and disadvantages
Applicable machining  materials
Applicable to industry product representatives
3-axis drilling and tapping cnc milling 

Because it is a linear track, the stroke speed is fast. If the tool change is a servo motor, the tool change time is fast.

Aluminum ,Copper Mobile phone shell,  electronic product  shell, radiator
3-axis machining center         Because this is Hard track, it travels slowly and has a strong rigidity. Stainless  steel,Iron,Titanium  alloy Mould,Tools
3+2 cnc milling The 4th axis is installed on the online track machine,  which can process various 3-sided parts. Aluminum ,Copper Electronic cigarette  parts, flashlight  housing shell parts
High-speed multi-head cnc milling It can be processed with multiple cutter heads simultaneously, and it is efficient and fast for precision cnc machining parts with a small amount of processing Aluminum, copper,   stainless steel Electronic cigarette  parts, Hand ornaments parts
5-axis CNC milling For curved custom machined components parts, the processing speed is slow and the cost is high.

Aluminum.  Copper,  Stainless  Steel,Iron

Engine impeller,  difficult precision cnc machining parts



How to choose materials and compare with national standards of various countries, so as to find precision cnc machining parts suppliers, or to facilitate communication during design?


We have prepared 40 kinds of material inventory to ensure that customers' prototypes and small batch precision machining parts production are completed within 24 hours.Some of our materials are approved by IMDS.


Material properties Material model   American Standard (ASTM) German standard (DIN)  Japanese Standard (JIS) Chinese Standard (GB) British Standard(BS)
Aluminum Aluminum6061 6061 AlMglSiCu  A6061 LD30 H20
Aluminum7075 7075 AlZnMgCu1.5  A7075 LC9 L95
Aluminum2014 2014 AlCuSiMg A2014 LD10 2014
Aluminum2024 2024 AlCuMg2 A2024 LY12 GB-24S
Aluminum5052 5052 AlMglSi0.5 A5052 LD31 H19
Aluminum6063 6063 ALMg2.5 A6063 LF2 NS4
Aluminum1060 1060 - A1060 L2 -
Aluminum1070 1070 A199.7 A1070 L1 -
Aluminum1080 1080 A199.8 A1080 LG1 1A
Stainless steel Stainless steel 304L 304L X2CrNi19-11 SUS304L 022Cr19Ni10 403S17
Stainless steel 316L 316L X7Cr14 SUS316L  022Cr17Ni12Mo2 416S21
Stainless steel 301 301  X5CrNi17-7 SUS301 12Cr17Ni7 -
Stainless steel 304 304 X5CrNi18-10 SUS304 06Cr19Ni10 -
tainless steel 430 430 X6Cr17 SUS430 10Cr17 -
Brass CuZn38Pb2 C37700 CuZn39Pb2 C3771 HPb59-1 CW612N
CuZn39Pb3 C38500 CuZn39Pb3 C3603 HPb58 CW614N
CuZn36Pb3 C38600 CuZn36Pb3 C3601 HPb63 CW603N
Copper   C10200 OF-Cu C1020 T1 C101
  C11000 SE-Cu C1100 T1 C101
steel Mild steel 1015 1015 C15 S15C 15 095M15
Mild steel 1045 1045 C45 S45C 45 080M46
Mild steel 1020 1020 C22 S20C 20 050A20
Titanium Titanium Grade 1 GR1 - TP270 TA1 -
Titanium Grade 2 GR2 - TP340 TA2 -
Titanium Grade 4 GR4 - TP550 TA4 -



How does precision CNC Machining VMT guarantee surface machining accuracy requirements in production?


During the production process, we will implement the stricter standards than ISO Tolerances DIN ISO 2768-1 for the unrequired parts, and the CNC machining standard tolerances of our machines.


Nominal linear range tolerance (mm) Linear dimensions DIN ISO 2768-F    Our metal parts     Our plastic parts  
0.5 up to 3 ±.0.05 ±.0.02 ±0.05
over 3 up to 6 ±.0.05 ±.0.03 ±0.05
over 6 up to 30  ±0.1 ±0.05 ±0.1
over 30 up to 120  ±0.15 ±0.05 ±0.15
over 120 up to 400 ±0.2 ±0.1 ±0.2
Nominal angle range tolerance (mm) Linear dimensions DIN ISO 2768-F Our metal parts Our plastic parts
≦10 ±1° ±1° ±1°
10~50 ±0°30′ ±0°30′ ±0°30′
50~120  ±0°20 ±0°20 ±0°20
120~400 ±0°10 ±0°10 ±0°10



How do we make every precision CNC machined part have a consistent quality during the production process?


We have also reserved 40 kinds of material inventory to ensure that customers' hand molds and small batch custom machining parts production are completed within 24 hours Some of the materials we use for custom CNC machining parts are approved by IMDS.


Quality record 
DFM identifies key dimensions
DFM report
Reduce customer drawing tolerances and issue in-plant engineering             
Identify key size
Procedur esheet
First article inspection before delivery First record
Line inspection during production Inspectio record
Process CPK control
SPC report
Sampling inspection of products in process
Shipmentin spection record  
Shipment inspection
Full size report
Reliability test
Material proof
Environmental protection requirements guarantee
ROHS report



VMT provides a variety of surface treatment methods for precision CNC machining parts to choose, all appearances are implemented according to Apple appearance standards.

Part material Surface treatment method Principle details Function and standard
Aluminum Clean Anodized Anodizing can enhance the wear and corrosion resistance of the surface of the precision CNC machining part, and increase the surface hardness. Hardness can reach 5UM-60UM
Color Anodized Rich colors increase brand value According to customer requirements, multi-color effects can be produced
Powder Coating Perform color matching according to Pantone and labor color card ral9016. High temperature resistance, wear resistance and additional force
Bead blasted Guarantee the statistical precision CNC machining parts surface effect,Can be implemented in accordance with Apple's surface grade requirements. According to SSPC—SP7 level execution
Brushing Use the surface to maintain uniform rules and beautiful lines. Can reach between Ra1.2UM-Ra40UM
Polishing Use a grinding wheel or cloth wheel and wax to remove to maintain the surface finish. Can reach between Ra1.2UM-Ra40UM
Stainless steel Polishing Use a grinding wheel or cloth wheel and wax to remove to maintain the surface finish. Can reach between Ra0.6UM-Ra1.6UM
Passivating Sandblasting The effect of passivated fine sand, the surface has corrosion resistance. According to SSPC—SP7 level execution
CrN. TiN. TiAlCN. TiCN. TiAlN, etc. are plated on the surface to make the surface clear and beautiful. Abrasion resistance, high cleanliness
Steel Polishing Use a grinding wheel or cloth wheel and wax to remove to maintain the surface finish. Can reach between Ra0.6UM-Ra1.6UM
Polishing, Plating Nickel/Chrome/Zinc The process of using electrolysis to attach a metal film to the surface of metal or other materials to prevent metal oxidation (such as rust), improve wear resistance, electrical conductivity, light reflectivity, corrosion resistance (copper sulfate, etc.) and Enhance beauty and other functions. According to ASTM B578-1987 (R2015) standard
Heat treatment Metal heat treatment is a process that heats, heats, and cools a metal precision CNC machining in a certain medium, and controls its performance by changing the surface or internal structure of the metal material. According to the standard BAC5617 execution
Powder coated The spraying effect of powder spraying is in terms of mechanical strength, adhesion, corrosion resistance, aging resistance, etc. Standard Guide for Testing Coating Powders and Powder Coatings in accordance with ASTM D 3451-2006
Brass Plating Nickel There are two processes of electroless nickel plating and electrolytic nickel plating, one is for conductive, the other is for decorative protection. 1. Improve anti-corrosion fatigue life. 2. Improve the service life of wear
Chrome The process of using electrolysis to attach a metal custom CNC machining parts film to the surface of a metal or other material. Improve precision CNC machining parts wear resistance, reflectivity, corrosion resistance (copper sulfate, etc.) and enhance aesthetics
Zinc The purpose of cold galvanizing is mainly to prevent rust, and hot galvanizing has high anti-corrosion and anti-rust effect. ASTM B695-2000 and military C-81562 mechanical galvanizing technical standards
PVD Before the copper is used for PVD, we must first polish and chrome the copper, and then perform PVD, the effect is even more beautiful than the ordinary electroplated surface. Wear-resistant, high clarity, can be made in a variety of colors



The difference between rapid prototype precision cnc machining parts and mass production, how to truly achieve the quality that meets the requirements while making the efficiency higher and faster and reducing the cost?

Processing properties 
(More than 500 pieces of MOQ) mass production Required time
Drawing/Material/Size Drawing/Key size/Process breakdown 1 hour
DFM recognition           
Structure optimization Identify key dimensions, reference dimensions and speed adjustment
recommendations for tool path layout
2 hour
Process selection
  Drawings according to the process and description of key requirements 3 hour
Fixture Optional sharing Fixture Design a special fixture to optimize the clamping method 5 hour
Tool Choose a sharing tool Custom-made special tools Synchronize for 10 hours
Polishing Knife shape can be polished by hand Basically do not consider polishing  
Measuring tool Basically there are standard measuring tools, increasing the measurement time Customized special inspection tools Synchronize for 5 hours
Packing and shipping
Use shared packaging first
Customized special packaging materials Synchronize for 10 hours
Fast delivery, poor tolerance stability, and basic manual surface treatment The efficiency should be more than 30% faster, and the surface texture
is high


FAQ in CNC machining
  • 1.Why is the surface of precision CNC machining turning parts uneven or not smooth?

    The main reason is that in the finishing process, the performance of the cutting oil cannot meet the processing requirements. When the tool feed speed is too fast, the vibration caused by the rapid movement of the tool will easily leave an uneven track on the custom machined components parts surface. Sometimes the tool marks between two adjacent tool paths will have a certain difference, which is caused by the inconsistent cutting direction of the tool. To avoid this problem, you should use the full down milling method and use a special cutting oil.
  • Why are the tool marks on the side of precision CNC finishing milling too obvious? 

    The main reason for this problem is improper selection of the position and parameter of the tool advancement and retreat. The milling methods provided by different processing software will be different, but the depth selection of the tool and the parameter selection of the tool will all be provided. In addition, when using non-special cutting oil, due to insufficient pressure and anti-wear properties, the oil film breaks instantaneously during the processing, causing scratches on the workpiece. If you want to avoid the above improvement problems, you can make relevant adjustments from four aspects. The first is to select the feed point correctly, the second is to add an overlap when cutting in the middle, the third is to use full-cut deep processing when finishing the side surface, and the fourth is to use special cutting oil.
  • How to avoid tool change marks in the finishing milling process of precision machining parts?

    When finishing milling on the bottom or side, tool marks often appear. Many times people think this is an inevitable mistake. In fact, it is completely avoidable. In order to solve this problem, in the processing of the workpiece, the finishing of the concave corner needs to be replaced with a small tool. Due to the force and swing during the custom machined components parts process, it is easy to produce tool marks at the corners.
  • Why are there burrs or sharp edges on the precision cnc machining parts surface or sides after polishing?

    To solve this problem, you need to pay great attention to the use of tools and use special tools to ensure sharp cuts. In addition, it is necessary to plan the tool path and increase the secondary finishing tool path. That is, the surface is processed first, then the side surface, and then the surface is processed to ensure that there are no burrs and sharp edges, which are useful for workpieces that cannot be polished.
  • How to make special-shaped precision cnc machining parts to achieve finishing?

    For the finishing of some special-shaped custom machined components parts, the software usually has fitting errors. Sometimes if the calculation error is too large, it will cause deformation of the parts and affect the appearance. To solve this problem, you need to start with software and control errors. This value is reasonable, and neither affects the calculation speed nor deforms the workpiece.


How do we charge for our precision cnc machining? Choosing equipment suitable for product is the best way to ensure the quality and efficiency?





Machine photo



Machine model



Hourly charge USD


CNC multi-head engraving machine

 3-axis drilling and tapping cnc milling
3-axis drilling and tapping cnc milling 8USD
3+2 cnc milling 3+2 cnc milling 8USD
5-axis cnc milling 5-axis cnc milling 10USD






Why choose VMT precision CNC machining services?


  • In terms of machinery and equipment, all manufacturing plants are completed internally, and the factory is equipped with precision-carved CNC 3-axis CNC, 3+2CNC, and 5-axis CNC for this purpose.
    In terms of process, VMT has aluminum extrusion + CNC Machining, forging + CNC Machining, stamping and tensile welding + CNC Machining to cooperate with production. VMT is a parts supplier with the most complete equipment and technology for CNC Machining services in China!

  • Our online professional and efficient team will provide you with services 24 hours a day.

    Professional engineers review drawings online, and assist customers in optimizing engineering drawings for free, and participate in design suggestions and assistance.
    Quotation completion time goal: within 30 minutes DFM and optimized engineering drawing goal within 2 hours.
    Delivery time: the target of the prototype prototype of the urgent item is completed within 24 hours, and the target of mass production of the urgent item: 7 working days.

  • Professional engineers review drawings online, and assist customers in optimizing engineering drawings for free, and participate in design suggestions and assistance.

    Quotation completion time goal: within 30 minutes *DFM and optimized engineering drawing goal within 2 hours.
    Delivery time: the target of the prototype prototype of the urgent item is completed within 24 hours, and the target of mass production of the urgent item: 7 working days


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